Physics Unit27: Early Quantum Theory and Models of the Atom

1#

In a pair of accelerati:qqj7d;ej lqcn(n b+ jx4 *p/ing plates, such as found inside a CRT, the electrons are emit:/4bq7;pqcjn xqjned*lji+(ted

A. from the cathode which is positive, toward the anode which is positive.

B. from the cathode which is negative, toward the anode which is positive.

C. from the anode which is positive, toward the cathode which is negative.

D. from the anode which is negative, toward the cathode which is positive.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A blackbody is an ideal system t;0bq wy-6xv )l/,vt 6pimwbjehat

A. absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a "black" body).

B. emits 100% of the light it generates, but cannot absorb radiation of its own.

C. either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates.

D. absorbs 50% of the light incident upon it, and emits 50% of the radiation it generates.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which color in the visible spectrum is associated with vb3j.bbw v **xky*4ktune;29+ z c5aizi+qrsthe lowest temperature?

A. blue

B. green

C. orange

D. red

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Planck's constant

A. sets an upper limit to the amount of energy that can be absorbed or emitted.

B. sets a lower limit to the amount of energy that can be absorbed or emitted.

C. relates mass to energy.

D. none of the given answers

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The ratio of energy to frequency for a given photoh98,2nzxuywy.; g gh;f rbzf 5n gives

A. its amplitude.

B. its velocity.

C. Planck's constant.

D. its work function.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The fundamental SI units of Planck's cons d58e 4t0arri7xhp2 i6smxl5mnq:6a qtant are

A.

k g \cdot m / s

.

B.

k g \cdot m^{2} / s

.

C.

k g \cdot m / s^{2}

.

D.

k g \cdot m^{2} / s^{2}

.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Planck's constant has a valn vm5om-tb9qg)lw f0 .ue of

A.

1.055 \times 10^{- 34} J \cdot s

.

B.

6.626 \times 10^{- 34} J \cdot s

.

C.

8.85 \times 10^{- 12} J \cdot s

.

D.

8.988 \times 10^{9} J \cdot s

.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A photon is a particle th 9j,viq-dwg(ol- *llwat

A. has zero electric charge.

B. has zero electric field associated with it.

C. cannot travel in a vacuum.

D. has a velocity in a vacuum that varies with the photon frequency.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate statem:rc:lss 8a e hix4l;*qent?

A. In vacuum, ultraviolet photons travel faster than infrared photons.

B. Photons can have positive or negative charge.

C. An ultraviolet photon has more energy than an infrared photon.

D. Photons do not have momentum (i.e., they cannot exert pressure on things).

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is a photon?

A. an electron in an excited state

B. a small packet of electromagnetic energy that has particle-like properties

C. one form of a nucleon, one of the particles that makes up the nucleus

D. an electron that has been made electrically neutral

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy of a photon depends o(yhgm*za 5 r63cq6qr1upr. brn

A. its amplitude.

B. its velocity.

C. its frequency.

D. none of the given answers

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the wavelength of a photon is halved, by whatkyr3tsrtfh z.r(/ 9/ d factor does its energy change?

A. 4

B. 2

C. 1/4

D. 1/2

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which color of light has the-3vbs v pzu+o1 lowest energy photons?

A. red

B. yellow

C. green

D. blue

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The photoelectric effect is explainable assumixjour1 vt xpvc 1s*a+l5yh*,6ng

A. that light has a wave nature.

B. that light has a particle nature.

C. that light has a wave nature and a particle nature.

D. none of the above

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In order for a photon to eject an electron from a metajk ,mu46fi67v w;bl0h bx(fxe l's surface in the photoelectric effect, the photon'j ,u( ;hb 6xemw f7vifx40lk6bs

A. frequency must be greater than a certain minimum value.

B. speed must be greater than a certain minimum value.

C. wavelength must be greater than a certain minimum value.

D. momentum must be zero.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic energy of the photoelectron depends on which of the followinv -4fz6u e-w8 zf.zak:yhll/ bg?

A. intensity of light

B. duration of illumination

C. wavelength of light

D. angle of illumination

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of red light and a beam of violet li*jke h1:5q4dr- q--oe czezb zght each deliver the same power on a surface. For which beam is the number of photons hitting the surface per secondz 1keqzo* becjdz--e h-:4q 5r the greatest?

A. the red beam

B. the violet beam

C. The number of photons per second is the same for both beams.

D. This cannot be answered without knowing just what the light intensity is.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A metal surface is illuminateim12 3g3os wt(klyvytw i0 4j5.f /bhcd with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of th/i34y5ttgv s23kjyol1i h0w(.b mcw fe blue light is increased, electrons are ejected

A. at the same rate, but with more energy per electron.

B. at the same rate, but with less energy per electron.

C. at an increased rate with no change in energy per electron.

D. at a reduced rate with no change in energy per electron.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of X-rays of frequency f is )e(rqif5 ; 9fen:w3fkquze 32vziy3u incident upon a substance that scatters the beam in various directions. If we measure the frequency of the scat5rf)ufe:ke z qiu;z2y e39f3nw(i3qv tered X-rays, we will find

A. X-rays with frequency less than f.

B. X-rays with frequency greater than f.

C. only X-rays with frequency f.

D. X-rays with frequencies ranging from less than f to greater than f.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of X-rays of wavelength l is incident upon a substance that scatters the bp,5f z oxq-e(qsnt61h)2pf f *-cenw beam in various directions. If we measure the wavelength of the scattered X-rays, we will fifnb-q q eo)s(5ewf6 2ht f,p1npc*x-znd

A. X-rays with wavelength less than l.

B. X-rays with wavelength greater than l.

C. only X-rays with wavelength l.

D. X-rays which range in wavelength from less than l to greater than l.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a photon is scattered from an electron, there will be an increase iw7 o iut+qhuvcfcb-0 r0s10(x) k b3chn its

A. energy.

B. frequency.

C. wavelength.

D. momentum.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In the Compton effect, as the scatterink36ezj;gv x e5g angle increases, the frequency of the X-rays scattered at th vezj6exgk35;at angle

A. increases.

B. decreases.

C. does not change.

D. varies randomly.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a Compton scattering exp9 ebpp;qtqe)9e(v d:geriment, what scattering angle produces the greatest change igpq)eev:p qb ( e9t9d;n wavelength?

A.

0^{\circ}

B.

90^{\circ}

C.

180^{\circ}

D. none of the given answers

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When the accelerating voltage in an X-ray tube is doubled, tm(sx 59j/fdgs;a0 mcqu -nm3a he minimum wavelength of the X-rm-5smd nsjc(umax 0 /qg9a3f;ays

A. is increased to twice the original value.

B. is increased to four times the original value.

C. is decreased to one-half the original value.

D. is decreased to one-fourth the original value.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a proton passes through matter, it is possible for it to interact wiyh qbr-f4 o-hr23ca4o,piuywbk ,c+ 7th the matter in such a way that an elec-bu,+7rbhk foo2 i,rcw -hqyc a43y p4tron and a positron are produced; this interaction is referred to as

A. the photoelectric effect.

B. the Compton effect.

C. pair production.

D. none of the given answers

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As a particle travels faster, its de Braw98r c ukjqy4i+5adje -y .i/oglie wavelength

A. increases.

B. decreases.

C. remains constant.

D. could be any of the given answers; it depends on other factors.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an electron is accelerated to a highe;3qi f;y ou*ya fsdd53r speed, there is a decrease in its

A. energy.

B. frequency.

C. wavelength.

D. momentum.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which one of the following would tend to have the smallest wavelength if 3;gkoa7f;(+-dilys3 )xrx sjo d4d r ethey are mo y 4r ka7-3s)irxxdd 3;lg;+o(ejosd fving with the same speed?

A. electron

B. proton

C. baseball

D. bowling ball

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The reason the wavelike nature of a moving baseball i8 k-mt0 gv8vkl5rqh sq06qs;hs not noticed in everyday life is th t 605h gvqh8kq sql0svr;8mk-at

A. it doesn't have a wavelike nature.

B. its wavelength is too small.

C. its frequency is too small.

D. its energy is too small.

E. No one pays attention to such things except for the Mets; and they can't hit a curve ball anyway.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What advantage might an electron microfyd0 ria0 821ctp7gs +dhp2gd scope have over a light microscope?

A. Electrons are more powerful.

B. Shorter wavelengths are possible.

C. Longer wavelengths are possible.

D. none of the given answers

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The part of an electron microscope that plays t w+bpr; wwl+9z/hph r+he same role as the lenses do in an opticawp+pzww 9 rl/hrh++ ;bl microscope is

A. the vacuum chamber.

B. the coils.

C. the cathode.

D. the deflector plates.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following microscopes is capable of "photographing" individu/rui ujnucd/a )j) *j.al atom.ujajr/ jd*c /u)u)ni s?

A. light microscope

B. scanning tunneling microscope

C. transmission electron microscope

D. scanning electron microscope

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

According to the Bohr model of the atom, the angular momentum of an hx++hfa x;:hjmh*p1i electron arou+ *xhm j+fhx :;ihah1pnd the nucleus

A. could equal any positive value.

B. must equal an integral multiple of h.

C. must equal an integral multiple of h/2p.

D. decreases with time, eventually becoming zero.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an electron jumps from apu0(s*t*irb2jvx (ran orbit where n = 4 to one where n = 2

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The distance between adjacent orbit radiire- c pf.9d.5 dghpgd3 in a hydrogen atom

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy difference between adjacent orbit radi4m+ib 6vvxbnqri2 d-+i in a hydrogen atom

A. increases with increasing values of n.

B. decreases with increasing values of n.

C. remains constant for all values of n.

D. varies randomly with increasing values of n.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength,,p- uu8fj lhl corresponding to the most intense light emitted by a giant l,l p,8uj hf-ustar of surface temperature 5000 K?

A.

576 n m

B.

578 n m

C.

580 n m

D.

582 n m

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the frequency of the most intense radiation from an o h kga4i1k; /fm5 77s w7fvi0npg,f1(soe lxdzbject with temperat gex; shnw7ik1vsfd(fo40l kia/ 1z75fmp ,7g ure

100^{\circ} C

?

A.

2.9 \times 10^{- 5} H z

B.

3.9 \times 10^{13} H z

C.

1.0 \times 10^{13} H z

D.

1.0 \times 10^{11} H z

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy is carried by a photon with fk b sot(q.d 3oy)u+f;zmikhc 4t3-f7irequency 110 GHz?

A.

1.1 \times 10^{- 20} J

B.

1.4 \times 10^{- 22} J

C.

7.3 \times 10^{- 23} J

D.

1.3 \times 10^{- 25} J

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy is carried by a photon with a frequency of 1vinq1*8e nnbxcy.h :(sjz w2) 00,000 GHz?

A.

4.73 \times 10^{- 42} J

B.

4.37 \times 10^{- 24} J

C.

6.63 \times 10^{- 24} J

D.

6.63 \times 10^{- 20} J

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What frequency of electromagnetic raditzudvs-ynp*1b l54 a3ation has energy

4.7 \times 10^{- 25} J

?

A.

710 k H z

B.

4.7 M H z

C.

710 M H z

D.

1.4 G H z

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What frequency of electromagnetic radiation has an energy of (+vy ywnhi*crrpu6yt 1/rz; 1 58.1 meV?

A.

1.4 M H z

B.

711 M H z

C.

7.1 G H z

D.

14 G H z

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the photon e)on*qz8lmj) mvy3+vp nergy of red light having wavelength 640 nm?

A.

1.13 \times 10^{- 19} J

B.

1.31 \times 10^{- 19} J

C.

3.11 \times 10^{- 19} J

D.

1.94 \times 10^{- 19} J

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy, in joules, is carried by a photon of wave 4o52m4 i cx0 bepweawo)s6yh(length 660 nm?

A.

1.46 \times 10^{- 48} J

B.

3.01 \times 10^{- 19} J

C.

6.63 \times 10^{- 34} J

D. none of the given answers

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate are photons emitte4c+7r c gwbc g p*ge/4;owhj)3uv- xcpd by a 50-W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelejovpc gu)x c4h3*-wc/+cw; brg4p 7gength

589 n m

.)

A.

1.0 \times 10^{20} /

s

B.

1.5 \times 10^{20} /

s

C.

2.0 \times 10^{20} /

s

D.

2.5 \times 10^{20} /

s

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A metal has a work function of 4.5 eV. Find the w-t8fv9ed idhdsl3*/v c wl; *maximum kinetic energy of the photoelee w;/*d f v9ddlc8hl3*t-ivws ctrons if the wavelength of light is 250 nm.

A. zero

B.

0.37 e V

C.

0.46 e V

D.

0.53 e V

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelen znkb02,,latd/j 9fakgth 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. What is the work function oaf,2k/ alk0 b9tzjnd ,f the metal?

A.

0.500 e V

B.

3.04 e V

C.

3.54 e V

D.

4.12 e V

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelength 350 k(t 3xg/ciw hr luq)mr +fq96icm2m-;nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 eV. Whx ;uc)3/ifq 9(lqw2mi-mmgrtr6khc+ at is the threshold frequency?

A.

3.47 \times 10^{14} H z

B.

3.74 \times 10^{14} H z

C.

4.73 \times 10^{14} H z

D.

7.34 \times 10^{14} H z

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When light of wavelength 350 nm is incident on az ihth.v0q4i7 metal surface, the stopping potential of the photoelectrons is 0.500 eV. What is the maximumzqthvhi .40i 7 kinetic energy of the electron?

A.

0.500 e V

B.

3.04 e V

C.

3.54 e V

D.

4.12 e V

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A monochromatic light is incident on the surfaalp03 i 4rsq0e x3*rcxce of a metal with work function 2.50 eV. If a 1.0-V stopping pot40 qa3 ce0xrxsl3pr *iential is required to make the photocurrent zero, what is the wavelength of light?

A.

354 n m

B.

423 n m

C.

497 n m

D.

744 n m

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the scattering angle in Compton's scatteri90 dt wc-,mbgxng is 90e. What is the wavelength shift?xt 0,gd-9w mbc

A.

1.22 \times 10^{- 12} m

B.

2.43 \times 10^{- 12} m

C.

3.65 \times 10^{- 12} m

D.

4.85 \times 10^{- 12} m

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

X-rays of wavelength 0.20 nm are s1p9 y5gxg-:g ucp 1cqfcattered by a metal. The wavelength shift is obscg :p x1fg-gp y9uqc15erved to be

2.1 \times 10^{- 12} m

at a certain scattering angle measured relative to the incoming X-ray. What is the scattering angle?

A.

20^{\circ}

B.

40^{\circ}

C.

60^{\circ}

D.

80^{\circ}

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 1303j0 eu uhkf 9ch te(fb0/mny./e. What is the kinetic energhefybf0kutmen 39h0/cj/u ( .y of each recoil electron?

A.

2.5 M e V

B.

5.0 M e V

C.

7.5 M e V

D.

10 M e V

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength of the matter wave associated with a ball sx.d lwy7 7lg3of mass 0.50 kg moving with a speed of 25 m/sgwl 3s 7yl.x7d?

A.

3.5 \times 10^{- 35} m

B.

5.3 \times 10^{- 35} m

C.

3.5 \times 10^{- 33} m

D.

5.3 \times 10^{- 33} m

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the de Broglie wavelength of a ba4qe9aiwd + (b4tg)i2 q4 yejfrll of mass 200 g moving with a speed of 30 igj44 waeq+)qe d4(tbyr9i2f m/s?

A.

1.1 \times 10^{- 34} m

B.

2.2 \times 10^{- 34} m

C.

4.5 \times 10^{- 28} m

D.

6.7 \times 10^{- 27} m

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength of tq94k6j7h g xaj)w,*+ cphggzfov lg) /he matter wave associated with an electron moving with a speed oqo ghg/ ,wx7g6 v gjkajh9*cfp)4+zl)f

2.5 \times 10^{7} m / s

?

A.

29 p m

B.

35 p m

C.

47 p m

D.

53 p m

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated through a potential difference of 150 V 4+/g cmomid0t9aci5gzhay/.. What is its wagzda+.m 4acoii//g9m yt5h0 cvelength?

A.

0.1 n m

B.

1 n m

C.

1 m m

D.

1 c m

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by a pok6:+g 7m q 1r9brinnmitential difference of 100 V. What is its wavenr gr6i9n7 +:m imkqb1length?

A.

0.122 n m

B.

0.212 n m

C.

0.221 n m

D.

0.313 n m

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by a potential difference of 100 V. W s4nqwwnw48kb3o(34 -klyrpthat is its mome4n w8n- 3(kk4otyqbw w3plrs4ntum in

k g \cdot m / s

?

A.

3.45 \times 10^{- 24}

B.

3.54 \times 10^{- 24}

C.

4.53 \times 10^{- 24}

D.

5.43 \times 10^{- 24}

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is accelerated by a potential difference of 100 V. W: t(r11rlc kquyw d(r/hat is its kinetic l (1u qkcw(rdr/1y rt:energy?

A.

1.26 \times 10^{- 17} J

B.

1.62 \times 10^{- 17} J

C.

2.16 \times 10^{- 17} J

D.

2.61 \times 10^{- 17} J

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person of mass 50 kg has a wavelengfk+5f 1uib2b) ags 5; rdv*sg*o gzor-th of

4.4 \times 10^{- 36} m

when running. How fast is she running?

A. 2.0 m/s

B. 3.0 m/s

C. 4.0 m/s

D. 5.0 m/s

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron has a wavelength of 0.123tjm)0 (yh1 fcc nm. What is its energy in eV? (This energy is not itjc1 y0m)hfc( n the relativistic region.)

A.

20 e V

B.

60 e V

C.

80 e V

D.

100 e V

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If

r_{1}

is the smallest orbital radius around a single proton, then

r_{6}

is equal to

A.

36 r_{1}

.

B.

12 r_{1}

.

C.

6 r_{1}

.

D.

2.45 r_{1}

.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The electron of a hydrogen atomkl.j k9uyom -.71an cu makes a transition from the n = 5 state to the n = 2 sao7 ml9uy1-k njuk ..ctate. What is the wavelength of the emitted photon?

A.

344 n m

B.

434 n m

C.

443 n m

D.

523 n m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The binding energy of the hyh0z59 t3. lsafqy3dei)kv) zzx5hh+ydrogen atom in its ground state is -13.6 eV. What is the energy when it ishzz v 5 e.h)tx3saf iy)5y3k0dl+qh9z in the n = 5 state?

A.

2.72 e V

B.

- 2.72 e V

C.

0.544 e V

D.

- 0.544 e V

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A hydrogen atom in the ground state absorbs a photon of9nn3mml6vh r( .ix5bs energy 12.09 eV. To which state will the electron make a tr. msvr(nxm5 39in hl6bansition?

A. n = 2

B. n = 3

C. n = 4

D. n = 5

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ionization energy of the v +0fozm)ljg*neutral hydrogen atom?

A.

27.2 e V

B.

13.6 e V

C.

6.8 e V

D. none of the given answers

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ionization energy of singly ionized helium*8rzh w vrg9t3?

A.

54.4 e V

B.

27.2 e V

C.

13.6 e V

D. none of the given answers

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In making a transition from state n = 1 to state n = 2, the hydrogen atom mustwe8t jve+xmkw5e cjr3 4d e8)4:p2rot

A. absorb a photon of energy 10.2 eV.

B. emit a photon of energy 10.2 eV.

C. absorb a photon of energy 13.58 eV.

D. emit a photon of energy 13.58 eV.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In state n = 1, the energy of the hydrogen atom isj.6 7 fi1dly7neel)(tv9 h4wlyvgca+ -13.58 eV. What is its energy in jg .+a ) 1fvlld7y(c6hiwvn9 et4yle7 state n = 2?

A. -6.79 eV

B. -4.53 eV

C. -3.40 eV

D. -1.51 eV

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelength of a ruby laser is 694.3 nm. What isr 6*sxr zuo(ynje4a 03 the energy difference between the two ene(rn a*j4ur 6y3xzeos0rgy states involved in laser action?

A.

1.537 e V

B.

1.646 e V

C.

1.786 e V

D.

1.812 e V

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is moving about a single proton in an orbit charact hs8t5ej -.8ibzhib7w 75iz(rkj ;aty 1ogv g8erized by n = 4. 7z5( b.b kejtawtj 8z 87s51-hgoiiih8g; ryvHow many of the electron's de Broglie wavelengths fit into the circumference of this orbit?

A. 1

B. 2

C. 4

D. 16

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